Best external hardware for css gaming?

I am starting to get into css more seriously and I need advice on what stuff to buy to aid my css gaming. At the moment I have a 19 inch hanns g monitor with 75hz refresh rate, mx518, a generic keyboard, razer goliathus alpha mousemat and steelseries 5hv2 headset. I am soon going to buy the creative fatal1ty titanium pro series sound card so I will be able to use 5.1 headsets. I was considering the steelseries 7h, the roccat kave 5.1, the sennheiser 350/360/515 and the medusa speedlink 5.1. For mice I was considering the logitech g5 or the razer deathadder. For keyboards maybe one of the saitek cyborgs or eclipses or the razer black widow. And im not sure about mouse mats. I was set on the 2233rz for a monitor though because I don't care about 1080p but I want 120hz. Thanks for any answers.